TP-Link TD-8840T User Manual page 11

POWER: The Power socket is where the power adapter connects to.
ON/OFF: The switch for the power.
RESET: There are two ways to reset the Router's factory defaults.
Method one: With the Router powered on, use a pin to press and hold the Reset button for at
least 5 seconds. And the Router will reboot to its factory default settings.
Method two：Restore the default setting from "Maintenance-SysRestart" of the Router's
Web-based Utility.
LAN (4~1): Through the port, you can connect the Router to your PC or the other Ethernet
network devices.
ADSL: Through the port, you can connect the Router to the splitter or to the Internet directly.
TD-8840T ADSL2+ Modem Router User Guide
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